Mercedes Benz Viano 3.2 V6 / 3.7 V6 Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Mercedes Benz Viano 3.2 V6 and 3.7 V6 engine specialists. Compare prices on reconditioned, rebuilt and used M112 V6 petrol engines - supply & fit available nationwide.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £2,000 to £3,800
Used from £800 · Reconditioned from £1,600 · Common codes: M112.951, M112.970
From £800
Tested, bare/short engine
From £1,600
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz Viano 3.2 V6 / 3.7 V6 Replacement Engineto Finding the Best Mercedes Benz Viano 3.2 V6 / 3.7 V6 Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryMercedes Benz Viano 3.2 V6 / 3.7 V6 - Engine History & Specs at a Glance
The Mercedes Benz Viano 3.2 V6 and 3.7 V6 represented the premium petrol options in the W639 Viano range, powered by the M112 family of 18-valve SOHC V6 engines. While rare in the UK market - petrol Vianos account for under 10% of sales - these smooth, refined units offered effortless power delivery at the cost of significant fuel consumption【10†L30-L31】.
Variant HistoryMercedes Benz Viano 3.2 V6 / 3.7 V6 - Engine History & Specs at a Glance
The Mercedes Benz Viano 3.2 V6 and 3.7 V6 represented the premium petrol options in the W639 Viano range, powered by the M112 family of 18-valve SOHC V6 engines. While rare in the UK market - petrol Vianos account for under 10% of sales - these smooth, refined units offered effortless power delivery at the cost of significant fuel consumption【10†L30-L31】.
Mercedes Benz Viano 3.2 V6 / 3.7 V6
Fuel TypePetrol
Engine Size Range3.2L - 3.7L
Power Output Range190-235hp across the variant's historyEngine History Timeline
W639 Viano launched with M112.951 3.2L V6 petrol 190hp (140kW), 270Nm torque, 5-speed automatic transmission
M112.970 3.7L V6 petrol introduced as a special-order option 235hp (175kW), 350Nm torque
M112 3.2L V6 discontinued as M272 3.5L V6 replaced it in facelift models
M112 3.7L V6 production ends as facelift Viano range transitions to M272 petrol units
Key Specs Snapshot
Fuel TypePetrolEngine Size Range3.2L - 3.7LPower Output Range190-235hp across the variant's historyTorque Range270-350NmYears Produced2003-2010Every M112 V6 petrol engine fitted to the Mercedes Benz Viano 3.2 and 3.7 is covered below, with UK rebuilt pricing and known failure points from real owner experience【1†L19-L20】.
Mercedes Benz Viano 3.2 V6 / 3.7 V6 Engine Codes - Specifications & Replacement CostMercedes Benz Viano 3.2 V6 / 3.7 V6 Engine Codes - Specifications & Replacement Cost
3.2L V6 Petrol (2003-2008)
Power Output190 hp (140 kW) @ 5,600 rpmTorque270 Nm @ 2,750-4,750 rpmDisplacement3,199ccConfigurationV6, SOHC 18-valve, naturally aspirated, 3-valves per cylinderYears Fitted2003-2008
Compatible Trim Levels
- Viano 3.2 V6
- Viano 3.2 V6 Ambiente
- Viano 3.2 V6 Trend
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£800-£1,800
Reconditioned
Addressed known issues, tested
£1,600-£2,600
Rebuilt
Full teardown, upgraded internals
£2,000-£3,200
Common Failure
The M112 V6 is known for head gasket degradation - the composite gasket design is prone to coolant-oil mixing, particularly after overheating events. Oil leaks from camshaft plugs (30mm and 65mm) and oil cooler seals are also common on higher-mileage examples【10†L20-L21】.
The Mercedes Viano 3.2 V6 and 3.7 V6 rely on the M112 V6 petrol engine - a smooth and refined unit that delivers effortless power, but has developed a well-documented reputation for predictable failures as mileages climb. Head gasket degradation, oil leaks from camshaft plugs, and thermostat failures are the most frequently cited issues【10†L20-L21】. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common Viano 3.2 and 3.7 V6 engine failures, what they cost to fix, and when replacement is the smarter financial decision.
Why the Viano 3.2 / 3.7 V6 Loses Coolant and Mixes Oil
Affected Vehicles
Mercedes Viano 3.2 V6, 3.7 V6 (M112.951, M112.970, 2003-2010)
Typical Failure Mileage
80,000 - 150,000 miles
Root Cause
The M112 V6 uses a composite head gasket design that is prone to degradation over time, particularly if the engine has been overheated. Coolant can leak into the oil galleries or oil into the cooling system, leading to overheating, loss of performance, and eventual engine damage【10†L20-L21】.
Why It Happens
The M112 V6 uses a composite head gasket design that is prone to degradation over time, particularly if the engine has been overheated. Coolant can leak into the oil galleries or oil into the cooling system, leading to overheating, loss of performance, and eventual engine damage【10†L20-L21】.
Dealer (parts + labour)
£1,800-£2,800
Specialist (parts + labour)
£1,200-£1,800
What it involves
Replace head gaskets with MLS (multi-layer steel) upgraded gaskets, pressure test heads, new bolts
Suitability
80k-150k miles; permanent fix with upgraded gaskets
1 - 2 daysDealer (parts + labour)
£4,000-£5,500
Specialist (parts + labour)
£2,200-£3,800
What it involves
Supply & fit reconditioned M112 with new head gaskets, timing components, and seals
Suitability
Full long-block warranty. Required if overheating has warped cylinder heads
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Head Gasket Replacement (Both Banks) Minor | £1,800-£2,800 | £1,200-£1,800 | Replace head gaskets with MLS (multi-layer steel) upgraded gaskets, pressure test heads, new bolts | 80k-150k miles; permanent fix with upgraded gaskets | 1 - 2 days |
 Full Replacement - Rebuilt M112 Engine Best Value | £4,000-£5,500 | £2,200-£3,800 | Supply & fit reconditioned M112 with new head gaskets, timing components, and seals | Full long-block warranty. Required if overheating has warped cylinder heads | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical Viano 3.2 or 3.7 V6 is worth £3,000-£8,000 depending on condition and mileage - the full replacement cost of £2,200-£3,800 is modest relative to vehicle value for most examples. For vehicles worth under £3,000, evaluate repair options first.
Our Recommendation
Our Recommendation
If you notice coolant loss without an external leak, oil in the coolant, or white smoke from the exhaust, have the head gaskets inspected immediately. Specialist head gasket replacement with MLS upgraded gaskets (£1,200-£1,800) is a permanent fix - use a specialist who has experience with M112 engines and can fit the updated MLS gaskets rather than OEM composite units.
Don't Let Engine Failure Write Off Your Mercedes Viano 3.2 or 3.7 V6
A failed M112 V6 engine doesn't have to mean the end of your Viano. Whether you're dealing with head gasket failure, oil leaks, or cooling system issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Viano specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.
Compare rebuilt M112 engine prices for your Viano 3.2 / 3.7 V6
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Mercedes Viano 3.2 V6 or 3.7 V6. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Mercedes Viano 3.2 V6 / 3.7 V6 Engine ReplacementFrequently Asked Questions
Question 1How much does a Mercedes Viano 3.2 or 3.7 V6 engine replacement cost in the UK-
A Viano 3.2 or 3.7 V6 engine replacement typically costs between £2,000 and £3,800 depending on condition type and whether fitting is included. M112 V6 units range from £2,000 to £3,800 supply only.
- Rebuilt M112 (Viano 3.2 / 3.7 V6): £2,000-£3,800 supply only
- Reconditioned units: £1,600-£3,000
- Used engines from breakers: £800-£2,200 but higher risk
- Labour for supply & fit adds £400-£800 to any engine price
Question 2Is the M112 V6 engine in the Viano 3.2 and 3.7 reliable-
The M112 V6 is fundamentally a smooth and refined engine, but it has several well-documented weak points as mileage climbs【10†L20-L21】.
- Head gasket degradation - composite gasket design prone to coolant-oil mixing
- Oil leaks from camshaft plugs (30mm and 65mm) and rocker cover gaskets
- Thermostat failure causing temperature fluctuations
- With preventative maintenance, these engines can exceed 150,000-200,000 miles
Question 3What are the signs of M112 head gasket failure in a Viano 3.2 or 3.7 V6-
The M112's head gaskets typically show warning signs before complete failure.
- Coolant loss with no visible external leak
- Oil in the coolant expansion tank (may appear milky or as a film)
- White smoke from the exhaust
- Engine overheating or temperature fluctuations
- Loss of power and rough running
Question 4Should I repair or replace my Viano 3.2 or 3.7 V6 engine-
Repair if the failure is isolated (e.g., head gaskets, oil leaks, thermostat). Replace if there's bottom end damage, bore scoring, or warped cylinder heads.
- Head gasket replacement with MLS gaskets: £1,200-£1,800 - permanent fix
- Rocker cover gasket replacement: £250-£450 - excellent preventative maintenance
- Thermostat replacement: £150-£300 - do this at first sign of temperature fluctuation
- Full M112 rebuild: £2,200-£3,800 - for catastrophic failure or 120k+ miles
- Given Viano 3.2 / 3.7 V6 values (£3,000-£8,000), a rebuilt engine is typically good value
Question 5How do I know which engine code my Viano 3.2 or 3.7 V6 has-
Check your vehicle log book (V5C) for the engine number, which includes the engine code prefix.
- V5C log book shows full engine number with code prefix
- Engine code stamped on cylinder block
- Viano 3.2 V6 (2003-2008): M112.951 (190hp)
- Viano 3.7 V6 (2005-2010): M112.970 (235hp)
- Service history documents list engine type
Question 6Can I fit a used Viano 3.2 or 3.7 V6 engine myself-
We strongly advise against DIY fitting on a Viano 3.2 or 3.7 V6. The M112 V6's weight, W639 subframe geometry, and ECU coding requirements demand specialist equipment and expertise.
- V6 engine weight requires proper lifting equipment
- Subframe must be lowered - not a driveway job
- ECU coding and immobiliser synchronisation required
- Specialist supply & fit costs £400-£800 - essential for a V6
Question 7What warranty comes with a reconditioned Viano 3.2 or 3.7 V6 engine-
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty, with many specialists offering 24-month coverage on M112 rebuilds. This includes parts and labour for any manufacturing defect or installation error.
- 12-month unlimited mileage is the minimum standard
- M112 rebuilds often include 24-month warranty
- All warranties cover parts, labour, and MOT compliance
- Extended warranties available at point of purchase
Why Choose UsCompare Mercedes Viano 3.2 / 3.7 V6Engine PricesToday
100+ Viano V6 engines supplied through our network
12-Month Warranty on every rebuilt Viano 3.2 and 3.7 V6 engine
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